You need to download a mod. I have found a mod pack with weather control and many other things. I have tested it, and it works fine. The link can be found under "Sources and related links" below this answer.
To make it rain/snow you type this wothout the quotes "weather/rain" to make it sunny type "weather/clear"
Download TMI or type ./weather sun ./time day im muit or SPC
you can't make rain but you can type a command /weather rain or /weather clear to make the rain or snow to stop
You press "t" (like you are going to type in chat) and type /time set (#)
/toggledownfall to stop or make rain in minecraft
To make it rain/snow you type this wothout the quotes "weather/rain" to make it sunny type "weather/clear"
In the chat box type in; /weather clear to make it sunny, /weather rain to make it rain or /weather thunder to create a thunderstorm
Minecraft has no rain forests, the current boimes, (as of 1.8) are:ForestTaigaSwamplandExtreme HillsDesertPlainsOcean
If you have cheats turned on (which you do when you create your world), open the chat box with t and type /weather clear
If you have enabled cheats in your world on the PC edition, the command to toggle rain on or off is /toggledownfall.
You can only turn off the rain if cheats are enabled. If they are, the command is /toggledownfall
I didn't make Minecraft.
There are no keys in minecraft!
You cannot tell when it is going to rain before it happens. It just...starts raining.
You have to have a mod (modification) to make a cannon. It is not in vanilla minecraft.
how to make a fire works in minecraft 1.5.2